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# NamespaceContext

`public interface NamespaceContext`
``

javax.xml.namespace.NamespaceContext

Interface for read only XML Namespace context processing.

An XML Namespace has the properties:

- Namespace URI: Namespace name expressed as a URI to which the prefix is bound
- prefix: syntactically, this is the part of the attribute name following the `XMLConstants.XMLNS_ATTRIBUTE` ("xmlns") in the Namespace declaration

example: `<element xmlns:prefix="http://Namespace-name-URI">`

All `get*(*)` methods operate in the current scope for Namespace URI and prefix resolution.

Note that a Namespace URI can be bound to multiple prefixes in the current scope. This can occur when multiple `XMLConstants.XMLNS_ATTRIBUTE` ("xmlns") Namespace declarations occur in the same Start-Tag and refer to the same Namespace URI. e.g.

     <element xmlns:prefix1="http://Namespace-name-URI"
              xmlns:prefix2="http://Namespace-name-URI">

This can also occur when the same Namespace URI is used in multiple `XMLConstants.XMLNS_ATTRIBUTE` ("xmlns") Namespace declarations in the logical parent element hierarchy. e.g.

     <parent xmlns:prefix1="http://Namespace-name-URI">
       <child xmlns:prefix2="http://Namespace-name-URI">
         ...
       </child>
     </parent>

A prefix can only be bound to a single Namespace URI in the current scope.

See also:

- `javax.XMLConstants for declarations of common XML values`
- XML Schema Part2: Datatypes
- Namespaces in XML
- Namespaces in XML Errata

## Summary

### Public methods
`abstract String` | `getNamespaceURI(String prefix)` Get Namespace URI bound to a prefix in the current scope.
`abstract String` | `getPrefix(String namespaceURI)` Get prefix bound to Namespace URI in the current scope.
`abstract Iterator` | `getPrefixes(String namespaceURI)` Get all prefixes bound to a Namespace URI in the current scope.

## Public methods

### getNamespaceURI

    public abstract String getNamespaceURI (String prefix)

Get Namespace URI bound to a prefix in the current scope.

When requesting a Namespace URI by prefix, the following table describes the returned Namespace URI value for all possible prefix values:

`getNamespaceURI(prefix)` return value for specified prefixes
prefix parameter | Namespace URI return value
`DEFAULT_NS_PREFIX` ("") | default Namespace URI in the current scope or ``XMLConstants.NULL_NS_URI("")`` when there is no default Namespace URI in the current scope
bound prefix | Namespace URI bound to prefix in current scope
unbound prefix | ``XMLConstants.NULL_NS_URI("")``
`XMLConstants.XML_NS_PREFIX` ("xml") | `XMLConstants.XML_NS_URI` ("http://www.w3.org/XML/1998/namespace")
`XMLConstants.XMLNS_ATTRIBUTE` ("xmlns") | `XMLConstants.XMLNS_ATTRIBUTE_NS_URI` ("http://www.w3.org/2000/xmlns/")
`null` | `IllegalArgumentException` is thrown

Parameters
`prefix` | `String`: prefix to look up

Returns
`String` | Namespace URI bound to prefix in the current scope

### getPrefix

    public abstract String getPrefix (String namespaceURI)

Get prefix bound to Namespace URI in the current scope.

To get all prefixes bound to a Namespace URI in the current scope, use `getPrefixes(java.lang.String)`.

When requesting a prefix by Namespace URI, the following table describes the returned prefix value for all Namespace URI values:

`getPrefix(namespaceURI)` return value for specified Namespace URIs
Namespace URI parameter | prefix value returned
<default Namespace URI> | `XMLConstants.DEFAULT_NS_PREFIX` ("")
bound Namespace URI | prefix bound to Namespace URI in the current scope, if multiple prefixes are bound to the Namespace URI in the current scope, a single arbitrary prefix, whose choice is implementation dependent, is returned
unbound Namespace URI | `null`
`XMLConstants.XML_NS_URI` ("http://www.w3.org/XML/1998/namespace") | `XMLConstants.XML_NS_PREFIX` ("xml")
`XMLConstants.XMLNS_ATTRIBUTE_NS_URI` ("http://www.w3.org/2000/xmlns/") | `XMLConstants.XMLNS_ATTRIBUTE` ("xmlns")
`null` | `IllegalArgumentException` is thrown

Parameters
`namespaceURI` | `String`: URI of Namespace to lookup

Returns
`String` | prefix bound to Namespace URI in current context

### getPrefixes

    public abstract Iterator getPrefixes (String namespaceURI)

Get all prefixes bound to a Namespace URI in the current scope.

An Iterator over String elements is returned in an arbitrary, implementation dependent, order.

The `Iterator` is not modifiable. e.g. the `remove()` method will throw `UnsupportedOperationException`.

When requesting prefixes by Namespace URI, the following table describes the returned prefixes value for all Namespace URI values:

`getPrefixes(namespaceURI)` return value for specified Namespace URIs
Namespace URI parameter | prefixes value returned
bound Namespace URI, including the <default Namespace URI> | `Iterator` over prefixes bound to Namespace URI in the current scope in an arbitrary, implementation dependent, order
unbound Namespace URI | empty `Iterator`
`XMLConstants.XML_NS_URI` ("http://www.w3.org/XML/1998/namespace") | `Iterator` with one element set to `XMLConstants.XML_NS_PREFIX` ("xml")
`XMLConstants.XMLNS_ATTRIBUTE_NS_URI` ("http://www.w3.org/2000/xmlns/") | `Iterator` with one element set to `XMLConstants.XMLNS_ATTRIBUTE` ("xmlns")
`null` | `IllegalArgumentException` is thrown

Parameters
`namespaceURI` | `String`: URI of Namespace to lookup

Returns
`Iterator` | `Iterator` for all prefixes bound to the Namespace URI in the current scope

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